Alas, a recent ISS passage and the ISS tracking questions pour in. :-)
I guess this is for Ray. Tracking ISS yesterday with APCC / Horizons / AP1200 worked reasonably well.
Video from the AP130 with 2x barlow and Canon T3i
During the tracking I tried to use the hand-paddle buttons to superimpose correction onto the tracking trying to keep the ISS in the camera view screen. It somehow worked a bit but I had the feeling that the tracking was 'fighting' me back. Once I pushed a button to move the ISS to the center 'something' pushed it back by a bit moments later. I got some success by over-compensating and ISS got then back (closer) to center. At one point in this effort however it got lost outside the view finder screen and never came back.
As always great shout-out to Ray for the excellent work he does!